#pragma once

#include <iostream>
#include <string>
#include <vector>
#include <semaphore.h>
#include <pthread.h>


template<typename T>
class RingQueue
{
private:
    void P(sem_t &sem)
    {
        sem_wait(&sem);
    }
    void V(sem_t &sem)
    {
        sem_post(&sem);
    }
    void Lock(pthread_mutex_t &mutex)
    {
        pthread_mutex_lock(&mutex);
    }
    void Unlock(pthread_mutex_t &mutex)
    {
        pthread_mutex_unlock(&mutex);
    }
public:
    RingQueue(int cap):_ring_queue(cap),_cap(cap),_productor_step(0),_consumer_step(0)
    {
        sem_init(&_room_sem, 0, cap);
        sem_init(&_data_sem, 0, 0);

        pthread_mutex_init(&_productor_mutex, nullptr); // 初始化生产者互斥锁
        pthread_mutex_init(&_consumer_mutex, nullptr); // 初始化消费者互斥锁
    }
    void Enqueue(const T &in)
    {
        P(_room_sem);
        Lock(_productor_mutex);
        _ring_queue[_productor_step++]=in;
        _productor_step%=_cap;
        Unlock(_productor_mutex);
        V(_data_sem);
    }
    void Pop(T* out)
    {
        P(_data_sem);
        Lock(_consumer_mutex);
        *out=_ring_queue[_consumer_step++];
        _consumer_step%=_cap;
        Unlock(_consumer_mutex);
        V(_room_sem);
    }
    ~RingQueue()
    {
        sem_destroy(&_room_sem);
        sem_destroy(&_data_sem);
        pthread_mutex_destroy(&_productor_mutex);
        pthread_mutex_destroy(&_consumer_mutex);
    }
private:
    std::vector<T> _ring_queue;
    int _cap;
    int _productor_step;
    int _consumer_step;
    sem_t _room_sem;
    sem_t _data_sem;

    pthread_mutex_t _productor_mutex;
    pthread_mutex_t _consumer_mutex;
};